52a2804a5c
Add a new function call to the ISA DMA API: isa_dmamaxsize(), which returns
...
the maximum transfer size for the specified DMA channel. Make all clients
of ISA DMA use this call to determine their maximum transfer size.
2000-02-07 22:07:27 +00:00
ee5f90d04c
If bus_dmamap_create() fails, free the DMA channel.
1999-03-22 07:06:09 +00:00
10817df7f0
Oops; remove obsolete code.
1999-02-22 02:33:48 +00:00
bd575a4ff6
Add support for demand mode with auto-init.
1999-02-22 02:32:43 +00:00
db3051d720
fix problems in many d_mmap routines:
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- returned EOPNOTSUPP rather than -1.
- no check for negative offset.
many of these fix potential security problems in these drivers.
XXX XXX XXX
the d_mmap cdev routine should be changed to have a prototype like:
paddr_t (*d_mmap) __P((dev_t, off_t, int));
by someone!
1998-11-19 15:38:20 +00:00
1b5fbe0b89
DRQ 4 is used to chain the two 8237s together. Make sure it's always
...
cascaded and that it will be unmasked when DMA is thawed after being
frozen. (This also has the effect of making sure that no device ever
erroneously gets DRQ 4.)
1998-07-08 05:23:23 +00:00
ad3073beaf
Add an additional ISA DMA mode: LOOPDEMAND. This is for devices, such
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as the Shark's CS8900 Ethernet, which want to use the DMA controller in
this mode (as opposed to single mode).
[Editor's note: committed from a Shark using a new bus_dma back-end
and a CS8900 driver converted to use the MI code :-]
1998-06-28 06:59:35 +00:00
ab5b45577b
Don't panic if a DRQ is already allocated. Instead, just return EAGAIN
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to indicate that the resource is unavailable.
1998-06-25 19:18:05 +00:00
680a3d77f4
Add isa_dma{freeze,thaw}(), used to temporarily stop and then restart
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all ISA DMA. Needed by e.g. the SmartCard reader for Sharks.
1998-06-09 01:04:17 +00:00
ff76b8e96b
Change the ISA DMA API to take an isa_chipset_tag_t rather than
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a struct device * corresponding to the ISA bus device. The ISA DMA
controller driver functions have been renamed and now take a struct
isa_dma_state *, and are called indirectly by machine-dependent code
which provides the DMA state.
These changes allow e.g. `ofisa' (the OpenFirmware configuration
mechanism for the ISA bus, used by e.g. Sharks) to use the MI ISA
DMA controller code.
1998-06-09 00:00:21 +00:00
8abe76d2f0
Add offset and length parameters to bus_dmamap_sync(), used for specifiying
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partial syncs of a DMA mapping.
1998-02-04 05:12:46 +00:00
7e062e8a4e
Enable use of bus_dmamem_mmap().
1997-09-05 01:48:33 +00:00
420b75952f
Insert a sanity check so we get a panic instead of a kernel page
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fault if the DMA map is missing.
1997-08-30 17:33:49 +00:00
3bcc377a4c
Implement a function to test if a drq is taken and use it
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in two drivers. There are still many drivers left to fix...
1997-08-04 22:13:32 +00:00
cf8a170732
Don't panic when creating a bus dma map for a taken dma channel,
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it can happen during probing.
1997-07-31 22:20:47 +00:00
a63034762b
Audio: Remove the machine dependant code I put in audio.c by mistake.
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This adds another method to audio_hw_if. Also remove a field from
audio_hw_if that was not read-only.
1997-07-28 20:56:05 +00:00
9745684ebe
Changes to the sudio system:
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- It is now possible to handle devices that want "looping" DMA,
e.g. the SoundBlaster correctly. The WSS and SB drivers use this.
To do this several new methods were introduced in audio_hw_if.
- Different silence handling (forced by previous change).
- The audio driver can now be mmap()-ed, but due to problems in
the VM system only for writing for now.
- The OSS (Linux) audio emulation takes advantage of some of the
new features.
1997-07-27 01:16:32 +00:00
11e78a6b0d
Pull thorpej-bus-dma branch into mainline.
1997-06-06 23:43:45 +00:00
9a7f1bfa84
Use single mode, not demand mode, for auto-initialize transfers.
1997-05-29 21:46:07 +00:00
e9028468cd
Don't use the TC bit to check for wraparound in isa_dmacount(); remember the
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transfer length and use that.
1997-05-28 20:02:39 +00:00
188dec4d19
Clean up a bit, and export isa_dmamask() and isa_dmaunmask() interfaces.
1997-03-21 02:17:11 +00:00
3523bc35d5
Add an isa_dmacount() function, to get the current residual count on a channel.
1997-03-21 00:00:21 +00:00
86373f8cf9
backout kprintf changes
1996-10-13 01:37:04 +00:00
58953408cb
printf -> kprintf, sprintf -> ksprintf
1996-10-10 22:04:48 +00:00
e8a8a6298c
- prototype fixes
1996-04-29 20:02:32 +00:00
004f5e8d39
Fix a slight biff with 16-bit DMA in last change.
1996-03-31 20:51:43 +00:00
d8026ad9ef
Oops; switched two bits.
1996-03-01 04:35:27 +00:00
f3b29ca5d2
Remove two unneeded `if's.
1996-03-01 04:13:25 +00:00
546ad9e88b
Add support to the ISA DMA framework for auto-initialize mode.
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Add experimental SB16 code, disabled for now.
1996-03-01 04:08:13 +00:00
3ec5928403
Keep the terminal count information around, as it's self-clearing.
1996-02-22 06:21:48 +00:00
4d6412e7bf
Move the terminal count check into a separate function.
1996-02-20 04:17:05 +00:00
8a640328ed
clean up several ISA device interfaces: autoconfiguration, header
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inclusion, and interrupt configuration. more work still needs to be done,
but it's getting better...
1995-04-17 12:06:30 +00:00
e25c1817cf
kernel_pmap --> pmap_kernel()
1995-04-10 13:08:28 +00:00
61800cfa25
Convert port, IRQ, and DRQ numbers to ints.
1994-11-18 22:07:32 +00:00
854d8d96dc
Rearrange slightly.
1994-11-04 19:25:34 +00:00
022ee8f7fe
new RCS ID format.
1994-10-27 04:14:23 +00:00
057dc4deec
quiet compiler warnings
1994-05-23 03:02:13 +00:00
2f66816d8b
Rename two files.
1994-04-24 01:34:05 +00:00
221b25fd9d
Separate DMA functions.
1994-04-22 22:58:50 +00:00
3810963ed5
Add at_setup_dmachan(). Minor cleanup.
1993-10-22 20:24:14 +00:00
6067dc9ea8
Minor cleanup.
1993-10-17 05:34:23 +00:00
c73d85d341
Panic if DMA with odd length attempted on a 16-bit channel.
1993-10-16 03:55:59 +00:00
4f94812b29
New file with DMA code from isa.c, modified to check for some errors.
1993-10-14 05:22:57 +00:00
thorpej